Next Article in Journal
A Geometry-Based Welding Distortion Prediction Tool
Previous Article in Journal
A Versatile Punch Stroke Correction Model for Trial V-Bending of Sheet Metals Based on Data-Driven Method
Article

Modified Grape Seeds: A Promising Alternative for Nitrate Removal from Water

Faculty of Food Technology Osijek, Josip Juraj Strossmayer University of Osijek, Franje Kuhača 18, HR-31000 Osijek, Croatia
*
Author to whom correspondence should be addressed.
Academic Editor: Tao-Hsing Chen
Materials 2021, 14(17), 4791; https://doi.org/10.3390/ma14174791
Received: 19 July 2021 / Revised: 15 August 2021 / Accepted: 20 August 2021 / Published: 24 August 2021
(This article belongs to the Topic Multiple Application for Novel and Advanced Materials)
The aim of this work was to investigate grape seeds as a potential adsorbent for nitrate removal from water. Grape seeds were modified by quaternization and the applicability of the modified grape seeds (MGS) was evaluated in batch adsorption experiments. Fixed bed adsorption and regeneration studies were carried out to determine the regeneration capacity of MGS. The maximum adsorption capacity of 25.626 mg g−1 at native pH (6.3) for nitrate removal by MSG was comparable to that of the commercial anion exchange resin Relite A490 under similar conditions. The percent removal of nitrate from model nitrate solution was 86.47% and 93.25% for MGS, and Relite A490, respectively, and in synthetic wastewater 57.54% and 78.37%. Analysis of the batch adsorption data using isotherm models revealed that the Freundlich model provided a better fit to the data obtained than the Langmuir model, indicating multilayer adsorption. In kinetic terms, the results showed that the adsorption followed the pseudo-first order model. By investigating the adsorption mechanism, the results suggest that the intraparticle diffusion model was not the only process controlling the adsorption of nitrate on MGS. In column experiments (adsorption/desorption studies), three adsorption cycles were tested with minimal decrease in adsorption capacities, implying that this alternative adsorbent can be successfully regenerated and reused. View Full-Text
Keywords: nitrate removal; adsorption; adsorbent; grape seeds; column study nitrate removal; adsorption; adsorbent; grape seeds; column study
Show Figures

Figure 1

MDPI and ACS Style

Stjepanović, M.; Velić, N.; Habuda-Stanić, M. Modified Grape Seeds: A Promising Alternative for Nitrate Removal from Water. Materials 2021, 14, 4791. https://doi.org/10.3390/ma14174791

AMA Style

Stjepanović M, Velić N, Habuda-Stanić M. Modified Grape Seeds: A Promising Alternative for Nitrate Removal from Water. Materials. 2021; 14(17):4791. https://doi.org/10.3390/ma14174791

Chicago/Turabian Style

Stjepanović, Marija, Natalija Velić, and Mirna Habuda-Stanić. 2021. "Modified Grape Seeds: A Promising Alternative for Nitrate Removal from Water" Materials 14, no. 17: 4791. https://doi.org/10.3390/ma14174791

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop